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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6557682ec0a227c1349b258af4e3600844dd5e6bc2d37b80fc192c0a6bf37be1' 
  AND token = 'lb/iGoZKQnNaxuAO87esBLFK6nEfRs3WcfSpBNuN8Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}